Gas Law
Supplemental Instruction
Iowa State University / Leader: / Kia
Course: / CHEM 177
Instructor: / Anand
Date: / April 20th, 2017

Concept Check

  1. Fill in the blanks from the Kinetic-molecular Theory
  2. Gases consist of ______numbers of molecules that are in continuous random motion.
  3. The volume of the gas molecules is ______relative to the total volume of the container.
  4. Intermolecular forces between gas molecules are ______.
  5. Energy can be transferred between molecules during ______, but the average kinetic energy of the molecules ______.
  6. The average connect energy of the molecules is ______to the absolute temperature.
  7. Give 3 different units of pressure

Practice Question

  1. Complete the following table for an ideal gas:

P / V / n / T
2.00 atm / 1.00 L / 0.500 mol / ? K
0.300 atm / 0.250 L / ? mol / 27 degree C
650 torr / ? L / 0.333 mol / 350 K
? atm / 585 mL / 0.250 mol / 295 K
  1. The Goodyear blimps, which frequently fly over sporting events, hold approximately 175,000 ft3 of helium. If the gas is at 23 degrees C and 1.0 atm, what mass of helium is in a blimp?
  1. A 35.1 g sample of solid CO2 (dry ice) is added to a container at a temperature of 100 K with a volume of 4.0 L. If the container is evacuated (all of the gas removed), sealed and then allowed to warm to room temperature (T=298 K) so that all of the solid CO2 is converted to a gas, what is the pressure inside the container?
  1. Many gases are shipped in high-pressure containers. Consider a steel tank whose volume is 55.0 gallons that contains O2 gas at a pressure of 16,500 kPa at 23 degrees C.
  2. What mass of O2 does the tank contain?
  1. What volume would the gas occupy at STP?
  1. At what temperature would the pressure in the tank equal 150.0 atm?
  1. What would be the pressure of the gas, in kPa, if it were transferred to a container at 24 degrees C whose volume is 55.0L?
  1. Both Jacques Charles and Joseph Louis Guy-Lussac were avid balloonists. In his original flight in 1783, Jacques Charles used a balloon that contained approximately 31,150 L of H2. He generated the H2 using the reaction between iron and hydrochloric acid:

Fe(s) + 2 HCl(aq) à FeCl2(aq) + H2(g)

How many kilograms of iron were needed to produce this volume of H2 if the temperature was 22 degrees C?

ACS Final Practice

  1. The edge of a body-centered-cubic unit cell (which contains two atoms per unit cell) of an element Y was found to be 3.16x10-8 cm. The density of the metal is 19.35 g/cm3. What is the approximate molar mass of Y?
  1. Ammonia, NH3, reacts with the hypochlorite ion, OCl-, to produce hydrazine, N2H4. How many moles of hydrazine are produced from 5.85 mol of ammonia if the reaction has a 78.2% yield? 2NH3 + OCl- à N2H4 + Cl- + H2O

Challenge Question

  1. According to molecular orbital theory is Be2 or Be2+ expected to exist? Explain.